Sketching-board



C. S. JACOB.

SKETCHING BOARD. APPLICATION FILED OCT. 22, 1918.

Patented Oct. 26,1920.

l'lllllllll ATTORNEY,

oars.

"rare CHARLES srA vLnY JACOB; or ELIZABETH, NEW JERSEY. 5

SKETCHING-BOARD.

Specification of Letters IPatent.

Application filed October 22, 1918'. jSerialNo. 259,183. f

and more particularly to a board adapted forms in making rough sketchesin military and general field work, and for use ingiv-v ing instructionsin the art of making sketches of this character. I A sketching board,made in accordance with my invention, embodies therein, in

convenient form, all implements necessary for the user todeterminedirection, position and slopes, andfor accurately and rapidlyindicating the same at the desired scale upon the drawing paper.

It is also so constructed as to be con.-

veniently used in contourpwork,; and for judging the altitude ofdifferent elevations, and inorientation, resection and intersectionwork. I

With a board made in accordance with my invention, proficiency in therapid making of sketches may be readily acquired, and

the maintenance of a proper scale throughout the sketch is greatlyfacilitated.

While, in the use of a board made in.ac

cordance with my invention, a practical knowledge of topographicaldrawing, land-. scape and reconnaissance sketching, and rough surveyingwork, is essential, the structural characteristics of this board aresuchas .to facilitate sufiiciently accurate and rapid making of suchsketches, and to. keeps readily at'the hand 'ofthe user, all of theessential. tools and implementsand. indicatcd data, for facilitatingrapidity in theexercise .ofithis knowledge.

The invention consists in the novel fea-, tures of construction andcomblnatlon of.

parts hereinafter setpforth, and described,

and more particularly claims hereto appended.

vReferring to the drawings. 7

pointed out the Figure 1 is a top view of a drawing board my inventionbroken away in embodying places and Fig. 2 is a vertical sectionthereof.

Like letters refer to like parts'in both of said views. Y I

In the embodiment of my invention shown in the-drawings, a indicatesadrawing board made of suitable material, such as cleargrained whitepine, having adjacent the top "Te-rFF1EQ5 Patented O t. 26,1920.

thereof parallel slots aa ,having rotatably mounted therein parallelrollers Z) and 0,

adapted to receive and-feed a strip of paper d. Each roller 6 and c isprovided with an end disk as b and a, for turning said. r011 ers, theperipheries of which'have a se-' quence of grooves therein, coiiperatingwith whlch respectively are pivotal lock-plates 5 and 0 to hold thepaper taut when mak ing sketches, while permitting the free feed ing ofthe. paper. from one roller to the other,-when such is required. J 1

The portion of the board between the-slots a'a forms a suitable backingfor the paper (Z, and adjacent said slots and along the edges of'thespace between them. occupied by the paper, the board a has a sequence ofgraduations, facilitating the production of sketches to scale.

Adjacent the lower edge of the board is a segmental slot a theb'oardyalong' the inner aroof. said segment having slope .graduationsfor determiningv grades or slopes, and altitudes with a degree of -precision suitable. for the class of workkfor which the board is adapted tobe used. Said" board a, adjacent the top thereof and radially ofthecenter of the segment a has an opening a through which a plumb-line 6passes, the plumb-bob 6' carried bythis line being adapted to enter andhave movement;

in the segmental slot a "To permit theuse of the board for: contourwork, itis desirable that means be pro vided whereby, in repeatedlysighting over the top of the board, itmayalways be pobe adjusted, thuspermitting the user, by

holding the. plumb-bob in his mouth, .;to: maintain the" board'at theproper distance.

from the eye.

When the plumb-bob is not in use,-i't, to'- getherwithitsline,- isstoredin a 'socketa sitioned atthe same distance from the eye. 1 To meet thiscondition, I make the plumb-z line 0 adjustable in length by placing aspring cleat f upon the back of the board by 7 means of which the lengthof theline emay in the edge of the board, adjacent the open- Pencils ofdifferent colors are required, partlcularly in military sketching, and111 order to have such pencils conveniently accessible to the user, Iprovide a plurality of sockets in the edge of the board, adjacent thesocket an, adapted to receive pencils. All of these sockets are closedby means'of a pivotal plate g.

Seated in a recess in the boarda, adjacent the segmental slot 65*, is acompass 72; secured in place by a cross bar it having a sight h?coincident with the axis of the compass needle. This sight is providedfor the pur+ pose ofpermitting the user to locate an ob 'ect withrelation to the ma netic north as indicated by the compass. About theupper half of the compass, the board a is pro vided with protractorlines coinciding with the degree lines of the compass, the edge of theboard being'provided with corresponding graduations.

Piv'otally and slidably mounted upon the board a bymea'ns of a wing bolt2', is a slotted rule 'having graduations along both edges thereof, thescale of which corresponds with the scale markings at the sidesof theslots a and 66 The axis'of pivotal movement of this rule is alin'ed withthe axis of the compass needle, and with the center graduations at thetop and bottom of the portion of the board forming a backing for thepaper. The slot .in this rule extends along the center line oftherule'for a substantial portion of the length thereof,

affording the proper strength of material at the opposite ends thereof.

'Pivotally mounted upon the. rule'z' is an extension rule j, theconnection between these rules being by means of a slidable pivot screwfitting and its coiiperating thumb nut y". The rule j is also slotted inthe'same manner as the rule 2', the screw litting passing through, andthe nut j engag- 'ing the rule on opposite sides ofg'this slot.

Carried by the rule is a small 45 triangle 7a, which is mounted uponsaid rule by means of a suitable pivot screw fitting and thumb nut so asto be adjustable'thereon both lengthwise of the rule, and by a rotativemovement, to bringthe desire d edge of the triangle into'the properrelation with the rule, and the paper V 7 Both rules are preferably madeof flexible materia'h so as to permit the ends thereof to be moved awayfrom the board, and passed over the retaining bolts mm",' upon oppositesides of the wing bolt 71.

In the opposite upper corners of the board are two sights nn, to be usedin conjunction with the plumb-bob in approximating elevations. g

Both edges of the rules i and j. and all edges of the triangle 70 areprovided with -The various uses of a board'made in accordance with myinvention, will be apparent to anyone skilled in the line of work forwhich the board is particularly adapted, and may be readily acquired bya student in this class of work.

When the board is not in use, the rule 2' is centered with relation tothe wing bolt 6, and the ends thereof flexed and'passed over theretaining bolts m-m-. The rule 9" is then centered'with relation to saidbolt 2',

slipped over the head thereof, and its ends are passed over the boltsm4n",' these bolts then being turned to hold the rules flat'upon theboard.

- When it is desired to use the board, the rules are released by areversal of this open ation.

In determining slopes, and in. analogous work, the plumb-bob e" isbrought into the slota and the board is handled as wi'th the ordinaryslope board, the plumb-line e alining itself with one of the slopegraduations within the arc .of the opening afithus' indi eating thedegree ofthe slope.

For altitude work, the sights n'n are used in securing a sight upon thedesired object or location, the plumb-bob and line indicating theangular inclination of the board from which the altitude may be calculated upon the basis of other available data.

- The compass and its sight may be used in the usual manner inorientation, resection and intersection work, as well as for determining directions in the making of sketches.

The rules i and may be used as a T- square, the gage graduations aboutand ad ljacent the openings a and'a" facilitating the truing up of thissquare. By reason of the pivotal support of the rule 2' andthe pivotalslidable' connection between same and the rule 7', lines at any desiredangle may be readily drawn, the protrac'tor lines about the compasspandat the edge of the board, permitting absolute'accuracy in the' locatingof objects upon the map. The sight ]L2 is also useful in thisconnection.

The triangle is may be brought-to any 50- sition upon the rule j, and byreason of the graduations thereon, and upon said rule, the

' drawing may be readily kept toscale. Thescale markings upon the rule2' are particularly useful in securing a proper position of the rulej,particularly in drawing in the;

horizon, and incontour work. 7 V

-In landscape work, as heretofore stated,

the plumb-line may be used in order to inis highly desirable in a boardof this character, because thelwork required to bedone must be,accomplished, attimes, under most 7 trying and most difficultcircumstances.

Furthermore, clear, well defined sketches are desirable, and theflexibility of therules i and j by reason of their being pivotally andslidably supported in relation to the board,

and each other, ancL by reason of the scale markings thereon,facilitates accuracy in the making of the lines. I

The rule j may be brought so as to make a vertical line upon any portionof the paper (Z, or a horizontal line on any portion thereof with theassistance of the graduations about the openings a and (t and along thebacking surface between said openings. It may also be brought, by asimultaneous pivotal and sliding movement of the rules i and j, with thepivot j between'the center of the compass and the slot a into accuratealinement with any of the protractor lines about the compass, thusfacilitating accuracy in the location of different objects upon thepaper (Z when making a map for range finding purposes, or for greateraccuracy in the making of the map. As in other uses of the rules, thescale graduations thereon are also an important factor in thus locatingobjects upon the map, being made.

The structure of the board is such as to make it capable for variousother uses in the maklng of maps in military Work and other rough fieldwork, which will be apparent to those skilled in such work. The boardmay be used upon a tripod, or be held by hand, as desired, or asoccasion may-require. It combines in one structure all of the implementsnecessary for use in the making of sketches of the character which it isdesigned to facilitate, and all these are associated with the board in amanner to prevent their being misplaced, or lost.

The board amay be made of any desired dimensions,.-it being desirable tomake the various metallic parts of a non-magnetic metal, so as to avoidinterference with the compass. 1

It is not my intention to limit the invention to the precise details ofconstruction shown in the accompanying drawings, it

being apparent tat such may ;be .varied without departing fromthe-spirit and scope of the invention.-

Y Having .describedlthe invention, what I by'Letters Patent, is V V 1. Asketching board embodyil'lg therein a portion adapted tofserve as abacking for the paper said portion having about all edges thereof scalegraduations, a rule piv: otallymounted upon said board, a secondclaimasnew anddesire to have protected rule pivotally,,and slidablymounted-upon said first named rule, and a compass set into said, board,said board having pro-. tractor :lineS about said compass andcorresponding gr'afduations about the edge of the board, and said rulesea posite edges thereof, graduations to scale.

2.- A sketching board embodying therein "a portion adapted to serve'asabacking for the paper, said portion; having 1 about all edges thereofscale graduations,a rule piv otally mounted. upon said board, a secondrule pivotally, and slidably mounted upon said first named rule, acompass set into said board, said board having protractor lines aboutsaid compass and corresponding graduations about the edge of the board,and said rules each having upon opposite edges thereof, graduations toscale, and a triangle rotatably and slidably mounted upon said lastnamedrule. V

3. A sketching board embodying therein a portion adapted to serveas abacking for the paper, said portion having about all edges thereof scalegraduations, a rule pivotally mounted upon said board, a second rulepivotally, and slidably mounted upon said first named rule, a compassset into said board, said board having protractor lines about saidcompass and corresponding graduations about the edge of the board, andsaid rules each having upon opposite edgesthereof, graduations to scale,a cross bar holding said compassin position, and

with the aXis of the compass needle.

ch having upon opf a sight carried by said cross bar concentric LAsketching board embodying therein aportion adapted to serve as a backingfor the paper, said portion having about all,

edges thereof scale graduations, a rule pivotally' mounted upon saidboard, a second rule pivotally, and slidably mounted upon said firstnamed rule, a compass set into said board, said board having protractorlines about said compass and corresponding graduations about the edge ofthe board,

, having upon opposite edges thereof, graduations to scale, and headedscrew bolts arranged at opposite sides of the point of pivotal supportof said first named rule, said rules being of flexible material, andhaving slots therein through which said bolts may pass.

and said rules each 5. A sketching board embodyingtherein a'port ionhaving slots adjacent theopposite Sides thereof, forming a baeking forthe paper, intermediate said slots, rollers mounted 'insaid slotsadapted 'to hold and feed a paper strip, the board adjacent said slotsand said backing portion having scale gradriations thereon, meanswhereby said rollers may be locked against In0ve'n1ent,'a rule pivotallymounted upon said board, a second rule pivotallyjand 'slidably mountedupon said first named rule; and a compass set-into said board, saidboard having protractor lines about said compass and correspondinggradiiations about the edge of the'boa'rd, and said rules each havingupon opposite edges thereof, graduations'toscale.

6. sketching board embodying therein a portion adapted to serve as abacking for paper, said portion having about all edges thereof scalegr'adu'a'tions5 a rule having a slot therein for a substantial part ofthe length thereof, means seated in said slot parallel v A x the lengththereof,afitting maimed in the 'pfi dtauy and sli dably ca-matin saidride with the board; a second rule also having a slot therein for asubstantiarpertion of slots of said rifles re's'pectiifely, whereby saidlast named ruleis piil otaliy a'nd Qslidably connected With'sai'dfirst'named rule, a 06inpass set into said boardg 'said board havingprotri'ctbilines about said compass" and Corresponding g'ra'diiationsabout the edge of board, and said rules each having upon dp'posite'edges thereof, gradiiations to scale, and a triangl ro'tatablyIno'iinted upo' 'said last named rule.

In witness whereof I haye' hereiifito' affixed m signature, this 11th"da of 0cm:

N." C. Bmaiomi, R. C; TIGNoR'.

slidably r ber=,'1918;in the presence'of two-subscribing 4o

